The verse you have quoted in question is
तेऽग्निमब्रुवन् जातवेद एतद्विजानीहि किमेतद्यक्षमिति तथेति ॥ 16 ॥
te'gnimabruvan jātaveda etadvijānīhi kimetadyakṣamiti tatheti || 16 ||
They addressed the Fire thus “O Jataveda! Find out what this Great
Spirit is.” He said “yes.”
And the your translation is - the knower of the Vedas.
Although it is somewhat right in vedic perspective as all knowing , when we consider Agni as Brahman himself. But here the meaning should be taken differently . I.e. repository of knowledge , or who is born for the sake of vedas etc. Lets see this in detail.
The meaning of Jataveda and why Agni is called so is provided in Mahabharata
- Sabha Parva - Digvijaya Parva - chapter 231 - Verse 42
पावनात् पावकश्चासि वहनाद्भव्यवाहन : |
वेदास्तवदर्थं जाता वै
जातवेदास्ततो ह्यसि ||42 ||
p. 64 The Veda have sprung for ministering unto thee, and, therefore,
thou art called Jataveda.
That means for whom the Vedas originated is said to be Jataveda. Here the meaning of word jata is -"who is born" . Vedaha - For Vedas.
Here is Hindi translation of above verse.
A different meanig of Jataveda is also stated in Section two - Verse no. 1 of Mahanarayana Upanishad
- by Swami Vimalananda - Page 93 as follows .
जातवेदसे सुनवाम सोममरातीयतो निद्हति वेद : | स न: पर्षदाति दुर्गाणि
विश्वा नावेव सिन्धुं दुरितात्यग्नि ||1|
May we offer oblations to soma to jata-vedas. May the all knowing one
destroy what is unfriendly to us. May he , the divine fire that leads
all , protect us by taking us across all perils even as a captain
takes the boat across the sea. May he also saves us from all wrongs.
In the notes given below the above verse Vimalananda explaning that
Agni who is repository of knowledge. Jatavedas , interpreted
physically as fire stands , stands for the all knowing divine reality
that is worshiped within vedic rituals. The word veda and vedas in
this stanza stand for one who knows everything i.e. the divine fire.
I.e..Agni knows everything and hence called as Jataveda. Agni is One who know past, present and future and is called as Jataveda.